: Offers the original Spanish text in various formats, including ePub and Kindle.

: The story follows two main characters: Critilo (the "critical man," representing reason and experience) and Andrenio (the "natural man," representing impulse and innocence). After Critilo rescues Andrenio from a shipwreck, they travel together through various stages of life—Spring (Youth), Autumn (Maturity), and Winter (Old Age).

: Often provides the best-formatted, modern editions of public domain classics.

: Each "Isla" (island) or encounter represents a social vice or a stage of human development.